miim

### Note on CW43L Probe Changer

PC-DMIS uses the first two calibrated slots to calculate the "safety plane".

Assuming that X+ is the actual orientation of the rack, and if there are slots at different X values, the operator must calibrate as port 1 the port that sits behind (X=X1) and as port 2 the port that sits in front (X=X2), or vice-versa.

The value for the TCRackClearance registry entry is then added to X3 = MAX(X1, X2) to obtain the distance that the arm moves in +X (or -X) after and before performing the probe drop-off sequence.